SOUTHERN KLONDIKE HILLS. 
evel, is occupied by a playa, situated considerably west of the center 
jf the valley. Inliers of rock do not occur at a distance from the en- 
?ircling lulls, and the recent alluvial deposits are probably deep. 
Die Ramsey and Klondike wells struck water at 240 and 140 feet, 
•espectively. The Ramsey Well is 100 feet higher than the Klondike, 
md water could probably be obtained near the playa at shallower 
lepths. 
SOUTHERN KLONDIKE HILLS. 
TOPOGRAPHY AND GEOGRAPHY. 
Between Ralston Valley and the flat east of General Thomas Cam]) 
)re two groups of conical hills and ridges joined by a broad sag 
Formed of Siebert lake beds. These hills are sepa. ated from the 
jroldfield hills by a depression filled with Recent alluvial deposits, 
rhe highest peak in the northern part of the hills reaches an altitude 
)f 7,000 feet. The east slope of the group is comparatively gentle, 
while the west slope is steep. The hills are bare of timber and with- 
out water. 
GENERAL GEOLOGY. 
The formations of the Southern Klondike hills, named in order 
Prom the oldest to the youngest, include Cambrian sedimentary rocks, 
iost-Jurassic granite, earlier rhyolite, Siebert lake beds, earlier 
piartz latite, basalt, later rhyolite, later quartz latite, and earlier 
illuvium. The mapping to the south of the area of Siebert lake 
:>eds is approximately correct, while that to the north is less accurate. 
SEDIMENTARY ROCKS. 
Cambrian. — Cambrian rocks cover a considerable area in the 
southern part of these hills. They consist of an interbedded series 
\>i limestones, jasperoids, and shales, named in the order of their 
ibundance. Neither the top nor the bottom of the series is exposed, 
mt it is many hundreds of feet thick. The limestone, by far the 
)redominant member of the series, is dark gray or blue black, fine 
grained, compact, and crystalline. Bedding planes are from 2 to 3 
eet apart. Weathered surfaces are blackish gray in color and 
mooth in contour, although minor irregularities are produced by the 
arying hardness of the rock. The limestone grades into a silicified 
acies, best styled a jasperoid. This is ordinarily a dense-banded 
ock of black and gray color, the laminae of which are in many cases 
ut one-fourth inch in thickness. It breaks with a conchoidal frac- 
ire. The slaty shale is rather fine grained and of dark-gray or 
reenish-gray color. Even minor lenses and thin parting bands of 
f fine-grained sandstone are rather unusual. The sediments form 
ills of moderate slope with numerous exposures. No fossils were 
ound, but the lithology of the series is similar to that of the Lone 
